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Neuronal and behavioral differences between Mus musculus domesticus (C57BL/6JBy) and Mus musculus castaneus (CAST/Ei)
I Le Roy1, P L Roubertoux, L Jamot
1UPR CNRS 9074, Génétique, Neurogénétique, Comportement, Institut de Transgénose, Orléans, France.
Behavioural Brain Research
|October 1, 1998
Summary
Wild mice, like Mus musculus castaneus, show high genetic polymorphism compared to inbred strains. This study details their unique behavioral and physiological traits, offering valuable insights for genetic mapping and comparative studies.
Area of Science:
- Genetics and Genomics
- Neuroscience and Behavioral Science
- Animal Models
Background:
- Classical inbred mouse strains show limited genetic diversity via simple sequence repeats (SSRs).
- Wild-derived mice, such as Mus musculus castaneus, exhibit significant SSR polymorphisms (>90%) compared to inbred strains.
- Mus musculus castaneus and C57BL/6J show a 98% genetic difference, with fertile F1 offspring, making them suitable for gene mapping.
Purpose of the Study:
- To investigate the largely uncharacterized phenotypic characteristics of Mus musculus castaneus.
- To compare Mus musculus castaneus with established laboratory strains using standardized behavioral and physiological tests.
- To assess the potential of Mus musculus castaneus as a model for genetic studies due to its extreme genetic and phenotypic divergence.
Main Methods:
- Screening of Mus musculus castaneus and C57BL/6By for sensory-motor development, spontaneous behavior, paw preference, maternal behavior, aggression, and water maze learning.
- Analysis of hippocampal morphometry and male reproductive organ weight.
- Assessment of drug-induced seizure proneness using beta-CCM and comparison with data from other strains tested under identical conditions.
Main Results:
- Mus musculus castaneus and C57BL/6By differed in 69% of the assessed behavioral and physiological measures.
- The strain exhibited extreme positions (80% of comparisons) relative to a wide range of laboratory mice.
- Reactivity to beta-CCM indicated seizure proneness in Mus musculus castaneus.
Conclusions:
- Mus musculus castaneus presents a unique and extreme phenotype compared to common laboratory mouse strains.
- Its high genetic and phenotypic divergence makes it a valuable resource for gene mapping and understanding behavioral variation.
- Further research into this wild-derived strain can enhance the genetic dissection of complex traits.